Malicious PDF — malware analysis report

Static analysis result for SHA-256 4db492f2cada78c6…

MALICIOUS

PDF

83.1 KB Created: 2021-09-04 10:34:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2362397735ae0a639ea2be6ae28ac49d SHA-1: 92da420e09e41430f692f060445aee5626eea8f4 SHA-256: 4db492f2cada78c69bf23a159b4174624e64e081c9793373f79532cda8a0f8f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://inwebjor.ru/uplcv?utm_term=buku+kanker+serviks+pdf PDF link annotation
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/aa2ecd095fd8829b05211373035c4486/7760985004.pdfIn PDF document text
    • https://jv-cms.crazy-jessie.nl/uploads/files/76211425695.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/9b60ddf46847d320de070a4ffdfdf16c/33171573996.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/f867d3256b822315fb33ce161ee0b2df/59010383519.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/17330357391.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a649d48f4---99903830110.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/xamas.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/d2a25248f560a7552da9dd4aa0e90e99/kiwokug.pdfIn PDF document text
    • http://womensmentalhealthmd.com/clients/9/9a/9a9ccad1be43d50cbc9928f06550b956/File/83225147008.pdfIn PDF document text
    • http://billsky.ee/files/file/96199555133.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/wanutavejonobedewa.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/xekamamam.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/derow.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/3rtlrh4lp4apk7o2mhvdou33qk/vivoxomewuvikagu.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/gipaboga.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be9d90e8c52---toxipusuzubalurirakotoful.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/22765315080.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/20678160507.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/pukupojopunewepati.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160839e7fe6366---28745847310.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/9980992887.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4eb2972d2b---jasawusuz.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/73665116238.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5a07b87ec7---natefunox.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA06 17152 bytes
SHA-256: c5e64c96a673baa8c37b9eb5c445c57130fe1a3e59e08829666db18e10b61292
font_02_sfnt_off000126d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D4 10536 bytes
SHA-256: 5218521d989001ced40f12795df8e4e18cbf62510376db40150a42ed068e144d

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